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參數(shù)資料
| 型號： | DS3251N |
| 英文描述： | Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
| 中文描述： | 單/雙/三/四DS3/E3/STS-1柳斯 |
| 文件頁數(shù)： | 34/71頁 |
| 文件大?。?/td> | 925K |
| 代理商： | DS3251N |
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DS3251/DS3252/DS3253/DS3254
34 of 71
11.
11.1 PRBS Generator and Detector
Each LIU has built-in pseudorandom bit sequence (PRBS) generator and detector circuitry for physical layer
testing. The device generates and detects unframed 2
- 1 (DS3 or STS-1) or 2
- 1 PRBS, according to the ITU
O.151 specification. To transmit a PRBS pattern, pull the TDSA and TDSB pins high (hardware mode) or set
configuration bits TDSA and TDSB in the
GCR
register (CPU bus mode). As
Table 6-G
shows, the PRBS
generator automatically generates 2
15
- 1 for DS3 and STS-1 modes and 2
23
- 1 for E3 mode.
DIAGNOSTICS
The PRBS detector, which is always enabled (
Table 6-H
), reports its status through the PRBS output pin (hardware
and CPU bus modes) or through the PRBS and PBER status bits (CPU bus mode). When the PRBS detector is out
of synchronization, the PRBS pin is forced high. When the detector syncs to an incoming PRBS pattern, the PRBS
pin is driven low, then pulses high, synchronous with RCLK, for each bit error detected. See
Figure 11-1
and
Figure
11-2
for details. In CPU bus mode, the PRBS status bit is set to one when the detector is out of synchronization
and set to zero when the detector syncs to an incoming PRBS pattern. A change of state of the PRBS bit sets the
PRBSL bit in the
SRL
register and can also cause an interrupt on the
INT
pin if the PRBSIE bit in the
SRIE
register
is set to one. A pattern bit error set the PBERL bit in the
SRL
register and can also cause an interrupt if the
PBERIE bit in the
SRIE
register is set to one.
Figure 11-1. PRBS Output with Normal RCLK Operation
Figure 11-2. PRBS Output with Inverted RCLK Operation
11.2 Loopbacks
Each LIU has three internal loopbacks. See
Figure 4-1
and
Figure 4-2
. The LLB and RLB pins (hardware mode) or
LLB and RLB control bits in the
GCR
register (CPU bus mode) enable these loopbacks. When LLB = RLB = 0,
loopbacks are disabled. Setting RLB = 1 with LLB = 0 enables remote loopback, which loops recovered clock and
data back through the LIU transmitter. During remote loopback, recovered clock and data are output on RCLK,
RPOS/RDAT, and RNEG/RLCV, but the TPOS/TDAT and TNEG pins are ignored. Setting LLB = 1 with RLB = 0
enables analog local loopback, which loops the outgoing transmit signal back to the receiver’s analog front end.
Setting LLB = RLB = 1 enables digital local loopback, which loops digital transmit clock and data back to the
receiver’s digital circuitry, including the LOS detector, the B3ZS/HDB3 decoder, and the PRBS detector. When
either of the local loopbacks is enabled, the transmit signal is output normally on TXP/TXN, but the received signal
on RXP/RXN is ignored.
PRBS DETECTOR
IS NOT IN SYNC
PRBS DETECTOR IS IN SYNC; THE
PRBS PIN PULSES HIGH FOR EACH BIT
ERROR DETECTED
RCLK
PRBS
RCINV = 0
RCLK
PRBS
PRBS DETECTOR
IS NOT IN SYNC
PRBS DETECTOR IS IN SYNC; THE
PRBS PIN PULSES HIGH FOR EACH BIT
ERROR DETECTED
RCINV = 1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DS3252 | Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
| DS3252N | Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
| DS3253 | Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
| DS3253N | Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
| DS3254 | Single/Dual/Triple/Quad DS3/E3/STS-1 LIUs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS3251N+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Single DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3251NA3 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Single DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3252 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Dual DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3252+ | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Dual DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS3252A3 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC Dual DS3/E3/STS-1 Line Interface Unit RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
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